280465830 has 144 divisors (see below), whose sum is σ = 796539744. Its totient is φ = 68413440.

The previous prime is 280465817. The next prime is 280465837. The reversal of 280465830 is 38564082.

It is a super-2 number, since 2×280465830² = 157322163595177800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280465837) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1066279 + ... + 1066541.

It is an arithmetic number, because the mean of its divisors is an integer number (5531526).

Almost surely, 2^280465830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280465830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398269872).

280465830 is an abundant number, since it is smaller than the sum of its proper divisors (516073914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280465830 is a wasteful number, since it uses less digits than its factorization.

280465830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 280465830 is about 16747.1140797452. The cubic root of 280465830 is about 654.5758612242.

The spelling of 280465830 in words is "two hundred eighty million, four hundred sixty-five thousand, eight hundred thirty".